Adam is correct. No ebody cars were sold new in the UK. Although some were sold in mainland Europe through Simca deaerships. The cars were built in the USA though and were shipped in an almost finished condition with just the Euro things like the lights and a few other minor things to complete.

It is probably not that unusual for some parts to be made here and shipped to the USA or indeed other countries. But why only some and why are these ones more heavy?

A good example of things being made here for Chrysler is the Plymouth Prowler bodies which I believe were all made here in the UK and shipped to the USA for assembly.